APP倒计时启动海报/启动广告

1.appdelegate里面 设置window.rootVC为需要显示的海报/广告vc

LaunchADVC * vc = [[LaunchADVC alloc] init];

BaseNavigationController *vcNav = [[BaseNavigationController alloc] initWithRootViewController:vc];

self.window.rootViewController = vcNav;

2.launchADVC里画一个imageview

_adIV = [UIImageView new];

    _adIV.contentMode = UIViewContentModeScaleAspectFill;

    _adIV.clipsToBounds = YES;

2.1可以海报未加载出来时,先显示LaunchScreen里的图片,这样就可以使启动图与海报无缝衔接.

_placeholderIV = [UIImageView new];

    _placeholderIV.contentMode = UIViewContentModeScaleAspectFill;

    _placeholderIV.image = [self getLaunchScreenImg];

    [self.containerView addSubview:self.placeholderIV];

    [self.placeholderIV mas_makeConstraints:^(MASConstraintMaker *make) {

        make.top.left.right.bottom.mas_equalTo(self.containerView).offset(0);

    }];

-(UIImage *)getLaunchScreenImg

{

    UIViewController * vc = [[UIStoryboard storyboardWithName:@"LaunchScreen" bundle:[NSBundle mainBundle]] instantiateInitialViewController];

    CGRect rect = [UIScreen mainScreen].bounds;

    UIGraphicsBeginImageContextWithOptions(rect.size, YES, 0.0f);

    CGContextRef context = UIGraphicsGetCurrentContext();

    vc.view.frame= rect;

    [vc.view.layer renderInContext:context];

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;

}

[self.adIVsd_setImageWithURL:[NSURLURLWithString:resultDict[@"image_url"]]completed:^(UIImage*_Nullableimage,NSError*_Nullableerror,SDImageCacheTypecacheType,NSURL*_NullableimageURL)

                 {

                    self.placeholderIV.hidden=YES;

                    [self->_timerBtnstartTimer:5countDownBlock:^(boolisEnd) {

                        if(isEnd)

                        {

                            [selftimerBtnClick];

                        }

                    }];

                }];

3.后端设置上传的图片尺寸为1240*2208   ,要求设计图片的时候安全区域居中且尺寸为1100*2000(改尺寸并固定,可增宽增高) ,图片上需要显示的内容不要超出安全区域,不然有被裁剪掉的风险.